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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_regex.ref.regex_replace"></a><a class="link" href="regex_replace.html" title="regex_replace">regex_replace</a>
</h3></div></div></div>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
        The algorithm <a class="link" href="regex_replace.html" title="regex_replace"><code class="computeroutput"><span class="identifier">regex_replace</span></code></a> searches through a
        string finding all the matches to the regular expression: for each match
        it then calls <a class="link" href="match_results.html#boost_regex.match_results_format"><code class="computeroutput"><span class="identifier">match_results</span><span class="special">&lt;&gt;::</span><span class="identifier">format</span></code></a> to format the string and
        sends the result to the output iterator. Sections of text that do not match
        are copied to the output unchanged only if the <span class="emphasis"><em>flags</em></span>
        parameter does not have the flag <code class="computeroutput"><span class="identifier">format_no_copy</span></code>
        set. If the flag <code class="computeroutput"><span class="identifier">format_first_only</span></code>
        is set then only the first occurrence is replaced rather than all occurrences.
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
<span class="identifier">OutputIterator</span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
                             <span class="identifier">BidirectionalIterator</span> <span class="identifier">first</span><span class="special">,</span>
                             <span class="identifier">BidirectionalIterator</span> <span class="identifier">last</span><span class="special">,</span>
                             <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
                             <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                             <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
<span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span>
                                  <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
                                  <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                                  <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span>
</pre>
<h5>
<a name="boost_regex.ref.regex_replace.h0"></a>
        <span class="phrase"><a name="boost_regex.ref.regex_replace.description"></a></span><a class="link" href="regex_replace.html#boost_regex.ref.regex_replace.description">Description</a>
      </h5>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
<span class="identifier">OutputIterator</span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
                             <span class="identifier">BidirectionalIterator</span> <span class="identifier">first</span><span class="special">,</span>
                             <span class="identifier">BidirectionalIterator</span> <span class="identifier">last</span><span class="special">,</span>
                             <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
                             <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                             <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span>
</pre>
<p>
        Enumerates all the occurrences of expression <span class="emphasis"><em>e</em></span> in the
        sequence [first, last), replacing each occurrence with the string that results
        by merging the match found with the format string <span class="emphasis"><em>fmt</em></span>,
        and copies the resulting string to <span class="emphasis"><em>out</em></span>. In the case
        that <span class="emphasis"><em>fmt</em></span> is a unary, binary or ternary function object,
        then the character sequence generated by that object is copied unchanged
        to the output when performing a substitution.
      </p>
<p>
        If the flag <code class="computeroutput"><span class="identifier">format_no_copy</span></code>
        is set in <span class="emphasis"><em>flags</em></span> then unmatched sections of text are
        not copied to output.
      </p>
<p>
        If the flag <code class="computeroutput"><span class="identifier">format_first_only</span></code>
        is set in flags then only the first occurrence of <span class="emphasis"><em>e</em></span>
        is replaced.
      </p>
<p>
        The manner in which the format string <span class="emphasis"><em>fmt</em></span> is interpreted,
        along with the rules used for finding matches, are determined by the flags
        set in <span class="emphasis"><em>flags</em></span>: see <a class="link" href="match_flag_type.html" title="match_flag_type"><code class="computeroutput"><span class="identifier">match_flag_type</span></code></a>.
      </p>
<p>
        <span class="bold"><strong>Requires</strong></span> The type <code class="computeroutput"><span class="identifier">Formatter</span></code>
        must be either a pointer to a null-terminated string of type <code class="computeroutput"><span class="identifier">char_type</span><span class="special">[]</span></code>,
        or be a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        (for example <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span></code>)
        or be a unary, binary or ternary functor that computes the replacement string
        from a function call: either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">)</span></code>
        which must return a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        to be used as the replacement text, or either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span>
        <span class="identifier">out</span><span class="special">)</span></code>
        or <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>, both of which write the replacement text
        to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>,
        and then return the new OutputIterator position. In each case <code class="computeroutput"><span class="identifier">what</span></code> is the <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> object that represents
        the match found. Note that if the formatter is a functor, then it is <span class="emphasis"><em>passed
        by value</em></span>: users that want to pass function objects with internal
        state might want to use <a href="../../../../../../doc/html/ref.html" target="_top">Boost.Ref</a>
        to wrap the object so that it's passed by reference.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Constructs an <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> object:
      </p>
<pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
                                          <span class="identifier">i</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">),</span>
</pre>
<p>
        and uses <span class="emphasis"><em>i</em></span> to enumerate through all of the matches
        <span class="emphasis"><em>m</em></span> of type <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span></code>
        that occur within the sequence [first, last).
      </p>
<p>
        If no such matches are found and
      </p>
<pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&amp;</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
</pre>
<p>
        then calls
      </p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">out</span><span class="special">).</span>
</pre>
<p>
        Otherwise, for each match found, if
      </p>
<pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&amp;</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
</pre>
<p>
        calls
      </p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">m</span><span class="special">.</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">second</span><span class="special">,</span> <span class="identifier">out</span><span class="special">),</span>
</pre>
<p>
        and then calls
      </p>
<pre class="programlisting"><span class="identifier">m</span><span class="special">.</span><span class="identifier">format</span><span class="special">(</span><span class="identifier">out</span><span class="special">,</span> <span class="identifier">fmt</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">).</span>
</pre>
<p>
        Finally if
      </p>
<pre class="programlisting"><span class="special">!(</span><span class="identifier">flags</span> <span class="special">&amp;</span> <span class="identifier">format_no_copy</span><span class="special">)</span>
</pre>
<p>
        calls
      </p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">last_m</span><span class="special">.</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last_m</span><span class="special">.</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">second</span><span class="special">,</span> <span class="identifier">out</span><span class="special">)</span>
</pre>
<p>
        where <span class="emphasis"><em>last_m</em></span> is a copy of the last match found.
      </p>
<p>
        If <code class="computeroutput"><span class="identifier">flags</span> <span class="special">&amp;</span>
        <span class="identifier">format_first_only</span></code> is non-zero then
        only the first match found is replaced.
      </p>
<p>
        <span class="bold"><strong>Throws</strong></span>: <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code>
        if the complexity of matching the expression against an N character string
        begins to exceed O(N<sup>2</sup>), or if the program runs out of stack space while matching
        the expression (if Boost.Regex is configured in recursive mode), or if the
        matcher exhausts its permitted memory allocation (if Boost.Regex is configured
        in non-recursive mode).
      </p>
<p>
        <span class="bold"><strong>Returns</strong></span>: out.
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
<span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</span> <span class="identifier">regex_replace</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span>
                                  <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">e</span><span class="special">,</span>
                                  <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                                  <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span> The type <code class="computeroutput"><span class="identifier">Formatter</span></code>
        must be either a pointer to a null-terminated string of type <code class="computeroutput"><span class="identifier">char_type</span><span class="special">[]</span></code>,
        or be a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        (for example <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span></code>)
        or be a unary, binary or ternary functor that computes the replacement string
        from a function call: either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">)</span></code>
        which must return a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        to be used as the replacement text, or either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span>
        <span class="identifier">out</span><span class="special">)</span></code>
        or <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(</span><span class="identifier">what</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>, both of which write the replacement text
        to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>,
        and then return the new OutputIterator position. In each case <code class="computeroutput"><span class="identifier">what</span></code> is the <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> object that represents
        the match found.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Constructs an object <code class="computeroutput"><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">&gt;</span> <span class="identifier">result</span></code>, calls <code class="computeroutput"><span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">result</span><span class="special">),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">e</span><span class="special">,</span>
        <span class="identifier">fmt</span><span class="special">,</span>
        <span class="identifier">flags</span><span class="special">)</span></code>,
        and then returns <code class="computeroutput"><span class="identifier">result</span></code>.
      </p>
<h5>
<a name="boost_regex.ref.regex_replace.h1"></a>
        <span class="phrase"><a name="boost_regex.ref.regex_replace.examples"></a></span><a class="link" href="regex_replace.html#boost_regex.ref.regex_replace.examples">Examples</a>
      </h5>
<p>
        The following example takes C/C++ source code as input, and outputs syntax
        highlighted HTML code.
      </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">fstream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">sstream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">string</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iterator</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">fstream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>

<span class="comment">// purpose:</span>
<span class="comment">// takes the contents of a file and transform to</span>
<span class="comment">// syntax highlighted code in html format</span>

<span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">e1</span><span class="special">,</span> <span class="identifier">e2</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">expression_text</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">format_string</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_expression</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_format</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">header_text</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">footer_text</span><span class="special">;</span>

<span class="keyword">void</span> <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&amp;</span> <span class="identifier">is</span><span class="special">)</span>
<span class="special">{</span>
   <span class="identifier">s</span><span class="special">.</span><span class="identifier">erase</span><span class="special">();</span>
   <span class="identifier">s</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">is</span><span class="special">.</span><span class="identifier">rdbuf</span><span class="special">()-&gt;</span><span class="identifier">in_avail</span><span class="special">());</span>
   <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span>
   <span class="keyword">while</span><span class="special">(</span><span class="identifier">is</span><span class="special">.</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">c</span><span class="special">))</span>
   <span class="special">{</span>
      <span class="keyword">if</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">size</span><span class="special">())</span>
         <span class="identifier">s</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">*</span> <span class="number">3</span><span class="special">);</span>
      <span class="identifier">s</span><span class="special">.</span><span class="identifier">append</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="identifier">c</span><span class="special">);</span>
   <span class="special">}</span>
<span class="special">}</span>

<span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">**</span> <span class="identifier">argv</span><span class="special">)</span>
<span class="special">{</span>
   <span class="keyword">try</span><span class="special">{</span>
   <span class="identifier">e1</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">expression_text</span><span class="special">);</span>
   <span class="identifier">e2</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">pre_expression</span><span class="special">);</span>
   <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span> <span class="identifier">i</span> <span class="special">&lt;</span> <span class="identifier">argc</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span>
   <span class="special">{</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Processing file "</span> <span class="special">&lt;&lt;</span> <span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">fs</span><span class="special">(</span><span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]);</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">in</span><span class="special">;</span>
      <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">in</span><span class="special">,</span> <span class="identifier">fs</span><span class="special">);</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">out_name</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">".htm"</span><span class="special">));</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">ofstream</span> <span class="identifier">os</span><span class="special">(</span><span class="identifier">out_name</span><span class="special">.</span><span class="identifier">c_str</span><span class="special">());</span>
      <span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="identifier">header_text</span><span class="special">;</span>
      <span class="comment">// strip '&lt;' and '&gt;' first by outputting to a</span>
      <span class="comment">// temporary string stream</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostringstream</span> <span class="identifier">t</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios</span><span class="special">::</span><span class="identifier">out</span> <span class="special">|</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios</span><span class="special">::</span><span class="identifier">binary</span><span class="special">);</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream_iterator</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">oi</span><span class="special">(</span><span class="identifier">t</span><span class="special">);</span>
      <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">oi</span><span class="special">,</span> <span class="identifier">in</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">in</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
      <span class="identifier">e2</span><span class="special">,</span> <span class="identifier">pre_format</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_default</span> <span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">format_all</span><span class="special">);</span>
      <span class="comment">// then output to final output stream</span>
      <span class="comment">// adding syntax highlighting:</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">t</span><span class="special">.</span><span class="identifier">str</span><span class="special">());</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">ostream_iterator</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">out</span><span class="special">(</span><span class="identifier">os</span><span class="special">);</span>
      <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_replace</span><span class="special">(</span><span class="identifier">out</span><span class="special">,</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span>
      <span class="identifier">e1</span><span class="special">,</span> <span class="identifier">format_string</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_default</span> <span class="special">|</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">format_all</span><span class="special">);</span>
      <span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="identifier">footer_text</span><span class="special">;</span>
   <span class="special">}</span>
   <span class="special">}</span>
   <span class="keyword">catch</span><span class="special">(...)</span>
   <span class="special">{</span> <span class="keyword">return</span> <span class="special">-</span><span class="number">1</span><span class="special">;</span> <span class="special">}</span>
   <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>

<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_expression</span> <span class="special">=</span> <span class="string">"(&lt;)|(&gt;)|(&amp;)|\\r"</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">pre_format</span> <span class="special">=</span> <span class="string">"(?1&amp;lt;)(?2&amp;gt;)(?3&amp;amp;)"</span><span class="special">;</span>


<span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">expression_text</span> <span class="special">=</span>
   <span class="comment">// preprocessor directives: index 1</span>
   <span class="string">"(^[[:blank:]]*#(?:[^\\\\\\n]|\\\\[^\\n[:punct:][:word:]]*[\\n[:punct:][:word:]])*)|"</span>
   <span class="comment">// comment: index 2</span>
   <span class="string">"(//[^\\n]*|/\\*.*?\\*/)|"</span>
   <span class="comment">// literals: index 3</span>
   <span class="string">"\\&lt;([+-]?(?:(?:0x[[:xdigit:]]+)|(?:(?:[[:digit:]]*\\.)?[[:digit:]]+"</span>
   <span class="string">"(?:[eE][+-]?[[:digit:]]+)?))u?(?:(?:int(?:8|16|32|64))|L)?)\\&gt;|"</span>
   <span class="comment">// string literals: index 4</span>
   <span class="string">"('(?:[^\\\\']|\\\\.)*'|\"(?:[^\\\\\"]|\\\\.)*\")|"</span>
   <span class="comment">// keywords: index 5</span>
   <span class="string">"\\&lt;(__asm|__cdecl|__declspec|__export|__far16|__fastcall|__fortran|__import"</span>
   <span class="string">"|__pascal|__rtti|__stdcall|_asm|_cdecl|__except|_export|_far16|_fastcall"</span>
   <span class="string">"|__finally|_fortran|_import|_pascal|_stdcall|__thread|__try|asm|auto|bool"</span>
   <span class="string">"|break|case|catch|cdecl|char|class|const|const_cast|continue|default|delete"</span>
   <span class="string">"|do|double|dynamic_cast|else|enum|explicit|extern|false|float|for|friend|goto"</span>
   <span class="string">"|if|inline|int|long|mutable|namespace|new|operator|pascal|private|protected"</span>
   <span class="string">"|public|register|reinterpret_cast|return|short|signed|sizeof|static|static_cast"</span>
   <span class="string">"|struct|switch|template|this|throw|true|try|typedef|typeid|typename|union|unsigned"</span>
   <span class="string">"|using|virtual|void|volatile|wchar_t|while)\\&gt;"</span>
   <span class="special">;</span>

<span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">format_string</span> <span class="special">=</span> <span class="string">"(?1&lt;font color=\"#008040\"&gt;$&amp;&lt;/font&gt;)"</span>
                           <span class="string">"(?2&lt;I&gt;&lt;font color=\"#000080\"&gt;$&amp;&lt;/font&gt;&lt;/I&gt;)"</span>
                           <span class="string">"(?3&lt;font color=\"#0000A0\"&gt;$&amp;&lt;/font&gt;)"</span>
                           <span class="string">"(?4&lt;font color=\"#0000FF\"&gt;$&amp;&lt;/font&gt;)"</span>
                           <span class="string">"(?5&lt;B&gt;$&amp;&lt;/B&gt;)"</span><span class="special">;</span>

<span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">header_text</span> <span class="special">=</span>
   <span class="string">"&lt;HTML&gt;\n&lt;HEAD&gt;\n"</span>
   <span class="string">"&lt;TITLE&gt;Auto-generated html formatted source&lt;/TITLE&gt;\n"</span>
   <span class="string">"&lt;META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=windows-1252\"&gt;\n"</span>
   <span class="string">"&lt;/HEAD&gt;\n"</span>
   <span class="string">"&lt;BODY LINK=\"#0000ff\" VLINK=\"#800080\" BGCOLOR=\"#ffffff\"&gt;\n"</span>
   <span class="string">"&lt;P&gt; &lt;/P&gt;\n&lt;PRE&gt;"</span><span class="special">;</span>

<span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">footer_text</span> <span class="special">=</span> <span class="string">"&lt;/PRE&gt;\n&lt;/BODY&gt;\n\n"</span><span class="special">;</span>
</pre>
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<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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